Possible Clues:

• Mehitabel's pal
• Cockroach of literature
• Don Marquis' '-- and Mehitabel'
• Cockroach in Don Marquis stories
• Fictional cockroach with a typewriter
• Suffix meaning 'form of government'
• — And Mehitabel (Don Marquis)
• Don Marquis's six-legged poet
• Don Marquis' fictional cockroach
• Don Marquis creation